Method of mounting a blank



May 23, 1933. vy R BRADLEY ET AL 1,910,198

METHOD OF MOUNTING A BLANK Filed Dec. 26, 1929 H 5. 44 4a 40 H E71 H 5.

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Patented May 23, 1933 UNITED STATES PATENT OFFICE WALTER R. BRADLEY, OF CHICAGO, ILLINOIS, AND SIGURD THBONSEN, OF BALTIMORE, MARYLAND, ASSIGNORS TO WESTERN ELECTRIC COMPANY, INCORPORATED, 0] NEW YORK, N. Y., A CORPORATION OF NEW YORK METHOD OF MOUNTING A BLANK Application filed December 26, 1929. Serial No. 416,696.

This invention relates to a mounting for articles, and a method of forming mountings, and more particularly to a mounting for articles for use in drawing wire at high speed, and a method of forming same.

Objects of the invention are to provide an article mountin which will be eflicient, cheap and indestructi 1e, and a method of forming such mountings which will be practical,

economical and convenient.

One example of the invention contemplates the provision of a casing having a central aperture and annular recesses within the aperture. Two slugs of Monel lnetal are then partially drilled through and a die blank inserted in the cavity thus created. The assembled slugs and die blank are then cold pressed together and into the central aperture of the' casing, the metal of the slugs being swaged into theannular recesses of the casing, closing around the blank to engage all surfaces thereof. Another usage is to taper the central aperture of the casing and the sides of the slugs to prevent dislodgement of the die when wire is drawn therethrough against the taper. Under a third practice a funnel-shaped cavity is drilled in the easing and a single annular recess is imparted to the walls thereof into which is swaged the metal of a single blank carrying slug.

A thorough understanding of the invention is afforded by the following detailed description taken in conjunction with the accompanying drawing forming a part thereof in which Figs. 1 to 6, inclusive, illustrate the steps of a preferred embodiment, Figs. 7 to 14 a secondary embodiment and Figs. 15 to 20, inclusive, a third form.

Fig. 1 shows a cross sectional view of :1. casing used in mounting a. die blank;

Fig. 2 is a plan view thereof;

Fig. 3 is an elevation of a slug used in connection therewith;

Fig. 4 is a top plan view of the slug;

Fig. 5 is a view in section showing the preliminary assembly of the parts;

Fig. 6 is a fragmentary sectional view of a press by means of which the illustrated mounting of the die blank is accomplished;

Fig. 13 is a sectional view showing the method of assembling the parts;

Fig. 14 is a'fragmentary sectional view of a press by means of which the illustrated mounting of the die blank is accomplished;

Fig. 15 is a cross sectional view of a casing for use in connection with a third form;

Fig. 16 is a top plan view thereof;

Fig. 17 is a side elevation of a slug used in connection therewith;

Fig. 18 is a bottom plan view thereof;

Fig. 19 is a sectional view showing the preliminary assembling of the parts and Fig. 20 is a fragmentary sectional view of a press by means of which the illustrated mounting of the die blankis accomplished.

Referring to the drawing in which similar parts are indicated by identicalreference numerals, Figs. 1 to 6 are descriptive of the steps followed in the preferred embodiment. A conventional type of ring casing 31, which may be composed of nickel steel, phosphor bronze or other suitable type of hard, acid resisting metal, is provided with a central aperture 32, of any predetermined configuration, extending therethrough such as with a pair of annular recesses 33-33 in the wall of the aperture 32. A pair of slugs or holding members 3535 Figs. 3 and 4) composed of Monel metal, Tobin bronze, or aluminum bronze, or other material having a low coeflicient of thermal expansion are employed, and are each provided at a top 36 thereof with a cavity 39, which may be drilled or otherwise imparted thereto and which should be of a lesser diameter and a depth slightly less than one-half the size of a diamond, ruby, iridium steel, carborundum or other suitable type of die or die blank 40, (Figs. 5 and 6) which is to be mounted therein, so that when 100 the holding members 3535 are placed in juxtaposition with their respective cavities adjacent to each other, and the die blank 40 is placed therein, the holding members do not entirely surround the blank. In order to facilitate the boring of the die blank to size to form a die subsequent to the completion of the mounting steps as described below, the cavity 39 is extended in the form of a pit 41 for nearly the full depth of each holding member 35 as shown (Fig. 3). To assemble the mountings, the holding members 35 are placed in juxtaposition with the die blank 40 resting in the cavities 39-39 of the respective holding members, which are then inserted into the central aperture 32 of the casing 31 and pressed axially therethrough until the die 40 is midway of the thickness of the casing. Fig. 6 of the drawing indicates a suitable device for completing the mounting. It consists of a hydraulic or other suitable type of press 43 which, having a vertical aperture 44, is provided with a cylinder 45 resting upon a base 47, and, extending through the aperture 44, with a punch 48. The assembled parts are placed in the aperture 44 of the press on top of the cylinder 45 and subjected to the pressure of the punch 48, which pressure being effective upon the outside surfaces of both holding members 3535, cold presses them together along a line extending axially of the casing and causes the die or die blank 40 to become embedded in the material comprising the holding members. As the punch continues to descend. the material of the holding members is swaged or cold pressed to form tightly around the blank with such a force as to insure a gripping engagement of the holding members with every portion of the exterior surface of the blank. The material also cold flows into and fills each of the annular recesses 33 of the casing aperture, thereby efi'ectivelv locking the blank and its mounting within the ring casing against dislodgement under service conditions, when it is constantly subjected to the force of wire as the latter is being drawn through the die axially of the casing.

In the secondary embodiment a ring type of casing 49 is provided with a central tapered aperture 51. A holding member 52 having sides tapered to coincide with the lower portion of the aperture 51, is provided with a cavity 53 which is extended through the body of the holding member in the form of a pit 55. A larger holding member 56 for use in conjunction with the member 52 is provided with tapered sides 57 extending approximately one-half way up the side of the larger holding member and thereaoove with straight sides 59, so that a top 60 of the member 56 possesses a larger diameter than a bottom 61 thereof. The bottom 61 is drilled with a cavity 63 which terminates in a pit 64 extending almost entirely through the bod y of the holding member 56. It will be understood that the depth of each of the cavities 53 and 63 are somewhat less than one-half of the corresponding dimension of a die or die blank 65 to be mounted therein, so that when the smaller and the larger holding members are placed in juxtaposition with their ends having the cavities adjacent to each other, and the blank is placed therein, the holding members do not entirely surround the die blank 65. In assembling the parts mentioned, the smaller holding member 52 is inserted to rest in the bottom of the aperture 51 of the casing 49 in the manner shown in Fig. 13. The blank 65 is then placed to rest in the cavity 63 and the larger holding member 56 is inserted into the aperture 51 in juxtaposition with the smaller member 52 and super posed upon the blank 65 so that the holding members engage but do not entirely surround the blank 65. As so assembled, the parts are then subjected to pressure in the press 43 and a downward movement of the punch 48 forces the larger holding member 56 downwardly into the aperture 51. Under such pressure the blank 65 accommodates itself in the cavities 53 and 63 and upon continued downward movement of the punch 48, the material of the holding members cold flows around the blank 65 and along the tapered sides of the aperture 51, thus contacting with every portion of the surfaces of each to securely embed the die blank 65 therein. In this instance, the punch is provided with an annular wedge shaped bead 78 (Fig. 14) which forms a groove 79 in the upper surface of the casing 49, thereby swaging a portion of the material thereof centerward to firmly grip the periphery of the larger holding member. If it be understood that the mounting is designed to permit the wire to be drawn to pass through the die axially of the casing, and in direction from the larger end of the tapered aperture to the smaller, it will be readily seen that any tendency of the holding members to be loosened from the casing due to the tugging of the wire being drawn by the die is overcome by inclined condition of the sides of the tapered aperture.

In the third form a ring type casing 66 is drilled to form a centered funnel-shaped aperture 67 therein. In order to dispense with one of the holding members used above and to permit the casing 66 to function as a holding member in lieu thereof, an annular groove 68 is formed in the sides of the aperture 67 substantially at the base thereof, the drilling being continued until a pit 69 is formed, extending from the base of the aperture 67 to a bottom 70 of the casing. A single slug or holding member 71 is prepared for use in connection with this type of casing,

and consists of a top 72 and bottom 73, the latter being drilled to form an aperture 75 therein which terminates in a pit 76, the

latter extending through the body of the holding member almost to the top 72 thereof. A die or die blank 77 (Figs. 19 and 20) is then placed in the aperture 67 of the ring casing 66 and the holding member 71 inserted into the aperture and superposed upon the blank 77. The parts thus assembled are then placed in the press 43 and subjected to the pressure as used in the above described methods, with the result that the blank 77 accommodates itself in the bottom of the casing aperture 67, the material of the holding member 71 being swaged downwardly into the aperture 67 to firmly enclose the blank 77 therein. Dies so mounted are strung upon a wire which it is desired to draw in such a manner that the wire advances axially through the casing from the aperture 67 to the bottom 70, hence any pulling or other' tension exerted upon the die by the wire would have a tendency to secure it the more firmly in the bottom of the aperture 75, and it is therefore impossible to dislodge the die therefrom.

After the die blank mountings formed in the above described methods are removed from the press 43 they are subjected to a drill which, following the line of the pits, extends through the material of the holding members with a minimum of difliculty and bores a hole of the desired diameter through the blank to form a die. Subsequently, the completed die is polished and is then ready for stringing on the wire to be drawn. Where a completely bored blank, or in other words a die, has been mounted, the mountings are subjected to a drill which removes from the bore of the die that portion of the material of the holdinfl members which might become swaged thereinto during the mounting steps.

As pointed out above, the boring of the die or die blank is facilitated by the preparation of the pits in the holding members which define a substantially free path for the drilling tool. Furthermore, it will be noted that the hole drilled is parallel with the direction of application of the pressing force, and the tendency of the drill to separate the holding members, which would obtain were the hole to be drilled perpendicular to the direction of application of the pressing force and parallel with the line of demarcation between opposing holding members, is obviated. Any tendency of the compressing force to strain. crush or otherwise injure the die or blank is prevented from developing by the provision of the cavities in the holding members and the annular recesses in the casing whereby the material of the holding members, being forced against the die from opposite directions. is deflected somewhat and permitted to accommodate itself in the drilled areas until they have been filled. By following the described steps whereby the mounting material comprising the holding members is cold pressed or swaged about the blank, a practice of the invention permits the mounting of blanks or dies rigidly and immovably in casings without recourse to the use of heat, thus avoiding the formation of deleterious oxide films between the die and the holding members, the injurious effects upon the die occasioned by its being subjected to great heat or the proximity of molten metals, enabling a material reduction in weights for dies, and a material increase in the life thereof.

It is obvious that numerous changes both in the character and order of the steps described above might be practiced without departing from the spirit of our invention and it should therefore be limited only by the scope of the appended claims.

What is claimed is:

1. The method of mounting a blank which consists in forming a plurality of annual recesses within an apertured casing, treating a pair of holding members to produce a cavity in each, placing the holding members in juxtaposition or receive a blank therebetween to rest in each cavity, placing the holding members so positioned in the aperture of the casing and applying pressure axially of the aperture to press the holding members together to engage the blank therebetween and to simultaneously swage the holding members into the annual recesses of the casing.

2. A method of mounting a blank which consists in forming an aperture of a predetermined configuration in a casing, treating holding members to form cavities therein, placing the holding members in juxtaposition within the apertured casing with a blank therebetween resting in each cavity thereof,

and cold pressing the holding members in thecasing to embed the blank between their contiguous surfaces, and to cause the holding members to be firmly fixed therein.

3; A method of mounting a blank which consists in forming an aperture of a predetermined configuration in a casing, treating holding members to form cavities therein, placing the holding members in juxtaposition with the blank inthe cavities thereof, placing the ensemble of holding members with the blank therebetween into the aperture of the casing, and cold pressing the holding members to engage the blank along their contiguous surfaces, and to cause the holding members to conform with the configuration of the aperture in the casing and to be firmly fixed thereto.

4. A method of mounting a blank which consists in forming an aperture of a predetermined configuration in a casing, treating holding members to form cavities therein, placing one holding member into the bottom of the aperture of the casing. placing a blank thereinto, placing a second holding member in juxtaposition with the first holding member in the aperature of the casing with the blank therebetween, and cold pressing the holding figuratlon of fixed thereto.

In witness members to conform with the conthe aperture and being firmly whereof, we hereunto subscribe our names this 13 day of December A. D.,

WALTER R. BRADLEY. SIGURD THRONSEN. 

